US4250600A - Slotted fastener - Google Patents

Slotted fastener Download PDF

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Publication number
US4250600A
US4250600A US05/964,451 US96445178A US4250600A US 4250600 A US4250600 A US 4250600A US 96445178 A US96445178 A US 96445178A US 4250600 A US4250600 A US 4250600A
Authority
US
United States
Prior art keywords
slot
fastener
receptacle
widened
cam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/964,451
Other languages
English (en)
Inventor
Conrad J. Gunther
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dzus Fastener Co Inc
Original Assignee
Dzus Fastener Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dzus Fastener Co Inc filed Critical Dzus Fastener Co Inc
Priority to US05/964,451 priority Critical patent/US4250600A/en
Priority to EP79301742A priority patent/EP0011913B1/de
Priority to DE7979301742T priority patent/DE2964906D1/de
Priority to AT79301742T priority patent/ATE2631T1/de
Priority to US06/130,981 priority patent/US4442561A/en
Application granted granted Critical
Publication of US4250600A publication Critical patent/US4250600A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B21/00—Means for preventing relative axial movement of a pin, spigot, shaft or the like and a member surrounding it; Stud-and-socket releasable fastenings
    • F16B21/02—Releasable fastening devices locking by rotation
    • F16B21/04—Releasable fastening devices locking by rotation with bayonet catch

Definitions

  • a quarter turn fastener One type of fastener well known in the art is commonly called a quarter turn fastener.
  • a slotted stud is coupled with a receptacle having a cam follower for mating with the cam slot in the stud.
  • the quarter turn rotation between the stud and receptacle once the cam follower and slot are aligned will shift the assembly between the opened and closed positions.
  • These fasteners are used in mass numbers in environments such as the aircraft industry, for example, on large structures such as supersonic airplanes.
  • One of the features of the quarter turn fastener is ease of assembly and disassembly. This enables one to gain access to enclosures in a rapid and efficient manner.
  • the leading edge of the slot is widened, preferably along its full width, to facilitate coupling of the slot with a conventional cam follower mounted in a receptacle so that the cam follower easily enters the slot for rotation of the fastener into the locking position with a quarter turn rotation relative to the receptacle so that the follower travels into the locking detent at the end of the slot.
  • the widened end of the slot can be formed by relieving the end in a manner such as by back milling the slot after it has been formed so that a portion is cut at the leading open end of the slot angled outward from the surface of the slot forming the normal radius of curvature.
  • the object is to relieve the slot at an outward for a short distance along its length at the entry end providing for a wider opening for introduction of the cam follower and avoiding the presence of sharp edges interfering with introduction of the cam follower into the slot.
  • the fastener with the back milled end portion forming a widened opening also avoids the problem of "hang up” as the fastener is rotated to the open position with the cam follower travelling from the locking detent to the end of the stud.
  • the widened end of the slot avoids interference or "hang up” between the slot and the cam follower and the fastener is easily separated from the receptacle.
  • a pair of opposing complementing helical slots are formed on the surface of the fastener shank.
  • the pair of slots are positioned to mate with diametrically opposed inwardly extending cam follower tabs in a conventional receptacle.
  • a conventional way of constructing the fastener is to cut each slot by a milling process and then back milling to cut the relieved widened end portion.
  • Each slot is cut along a conventional helix and it has been found effective to relieve each slot for approximately 30 degrees from the open initial end of the slot.
  • FIG. 1 is a side elevation view of the fastener of the invention
  • FIG. 2 is a side elevation view thereof from a direction at 90 degrees to the direction of FIG. 1;
  • FIG. 3 is a top plan view thereof
  • FIG. 5 is a bottom plan view of the fastener in position for introduction to a fragmentary portion of a receptacle
  • FIG. 7 is a sectional elevation view thereof showing the elements of FIGS. 5 and 6 with the fastener coupled with a receptacle.
  • the end portion of the shank 28 distal from the head 22 includes a pair of opposing spiral cam slots 32.
  • Each slot 32 is cut from the leading edge 34 of the shank and extends along the shank towards the head and terminates in a locking detent 36.
  • each slot 32 In common manufacturing procedures it is usually found effective to cut each slot 32 by a common type of milling process, particularly when the material for the fastener is a hard rigid material such as zinc plated steel. Normally each slot 32 would be cut with a constant diameter until the point of the locking detent 36 is reached at which time the depression is cut for seating of the cam follower. However, in the present invention the leading edge portion of each slot 32 is widened along its full width to facilitate entrance and removal of a cam follower and avoid difficulty in assembly and the danger of "hand up" between parts when the fastener is removed from its receiving receptacle. An effective way to provide the widened portion is to back mill each slot 32 in its leading end portion to form a widened zone 38. It has been found effective for a common size fastener to back mill each slot for approximately 30 degrees from the leading edge. This forms zone 38 extending outward from the normal radius of curvature of the surface forming the slot.
  • leading tip of the fastener 20 which facilitates introduction of the fastener to a receptacle and helps to avoid "hang up” as the fastener is removed is the presence of a beveled or chamfered end portion 40.
  • Chamfered end portion 40 and widened back milled or relieved leading end portion 38 of each slot 32 cooperate to facilitate introduction of the fastener and avoid "hang up” of the fastener and receptacle when they are separated.
  • FIGS. 5-7 show the assembling procedure for fastener 20 with a conventional type of receptacle 42. Only the operative portion of the receptacle is shown in the drawing.
  • the receptacle is the conventional type of tubular receiving housing for the tubular shank 28 of the fastener and has diametrically opposed inwardly extending cam followers 44 in the form of a pair of tabs directed across the housing.
  • cam followers 44 in the form of a pair of tabs directed across the housing.
  • An appropriate tool such as a screwdriver is introduced into slot 24 in head 22 of the fastener and the fastener is rotated the approximate 1/4 turn to cause cam followers 44 to travel axially along the respective spiral slots 32 until they seat in respective locking detents 36.
  • Appropriate spring action is provided in the receptacle or on the stud (not shown) for accommodating the relative axial movement of the cam follower and the stud in travelling to the locking position.
  • the beveled forward end 40 forms an effective leading portion to avoid any interference with the surrounding edges of the rim of the receptacle.
  • the fastener reaches the cam followers 44, the widened or relieved back milled end portion 38 of each slot provides a wider opening for properly and easily locating each tab 44 in the entrance to a slot. The chances of interference between the tab and sharp edges at the entrance to the slot is minimized.
  • the fastener when the fastener is disassembled, the absence of sharp edges at the end of the slots with the presence of the relieved back milled widened portions 38 avoids "hang up” and permits free and easy removal of the cam follower tabs from the slots and the fastener.
  • the beveled or chamfered end portion 40 avoids any interfering surfaces between the fastener and the receptacle as the fastener is withdrawn from the receptacle housing through the open end 46.
  • An alternative fastener design could employ a single through slot in the end of the shank for coupling with a single cross pin acting as a cam follower in a conventional receptacle. Again a widened zone would be formed at the entrance end of the slot such as by back milling or a similar procedure.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Joining Of Building Structures In Genera (AREA)
US05/964,451 1978-11-29 1978-11-29 Slotted fastener Expired - Lifetime US4250600A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US05/964,451 US4250600A (en) 1978-11-29 1978-11-29 Slotted fastener
EP79301742A EP0011913B1 (de) 1978-11-29 1979-08-24 Sicherungselement mit Bajonettwirkung
DE7979301742T DE2964906D1 (en) 1978-11-29 1979-08-24 Quick-release fastener
AT79301742T ATE2631T1 (de) 1978-11-29 1979-08-24 Sicherungselement mit bajonettwirkung.
US06/130,981 US4442561A (en) 1978-11-29 1980-03-17 Slotted fastener

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/964,451 US4250600A (en) 1978-11-29 1978-11-29 Slotted fastener

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US06/130,981 Division US4442561A (en) 1978-11-29 1980-03-17 Slotted fastener

Publications (1)

Publication Number Publication Date
US4250600A true US4250600A (en) 1981-02-17

Family

ID=25508555

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/964,451 Expired - Lifetime US4250600A (en) 1978-11-29 1978-11-29 Slotted fastener

Country Status (4)

Country Link
US (1) US4250600A (de)
EP (1) EP0011913B1 (de)
AT (1) ATE2631T1 (de)
DE (1) DE2964906D1 (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110017521A1 (en) * 2009-07-23 2011-01-27 Mettler-Toledo Ag Gravimetric measuring instrument with releasable load receiver
US20110211863A1 (en) * 1995-03-27 2011-09-01 Canon Kabushiki Kaisha Coupling part, photosensitive drum, process cartridge and electrophotographic image forming apparatus
US20110214224A1 (en) * 2010-03-03 2011-09-08 Maddux Larry E Helmet with partial turn faceguard mounting
US20130261630A1 (en) * 2011-07-19 2013-10-03 Robert Courtney, Jr. Osteotome extractor
US20150104247A1 (en) * 2013-10-15 2015-04-16 Dtech Precision Industries Co., Ltd. Grooved rotatably fastening structure, rotatably fastening combo, and packaging structure
US9788591B2 (en) 2007-04-16 2017-10-17 Riddell, Inc. Quick release connector
USD840539S1 (en) 2010-07-06 2019-02-12 Tornier, Inc. Prosthesis anchor
US10456264B2 (en) 2014-01-24 2019-10-29 Tornier, Inc. Humeral implant anchor system
US10463499B2 (en) 2016-03-25 2019-11-05 Tornier, Inc. Stemless shoulder implant with fixation components
US11129724B2 (en) 2016-07-28 2021-09-28 Howmedica Osteonics Corp. Stemless prosthesis anchor component
USD951449S1 (en) 2019-10-01 2022-05-10 Howmedica Osteonics Corp. Humeral implant
US11364127B2 (en) 2018-10-02 2022-06-21 Howmedica Osteonics Corp. Shoulder prosthesis components and assemblies
US11399948B2 (en) 2017-12-11 2022-08-02 Howmedica Osteonics Corp. Stemless prosthesis anchor components and kits
US11642223B2 (en) 2019-10-01 2023-05-09 Howmedica Osteonics Corp. Shoulder prosthesis components and assemblies
US11974925B2 (en) 2017-09-25 2024-05-07 Howmedica Osteonics Corp. Patient specific stemless prosthesis anchor components
US12023253B2 (en) 2014-01-24 2024-07-02 Howmedica Osteonics Corp. Humeral implant anchor system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2139792T3 (es) * 1994-08-09 2000-02-16 Salice Arturo Spa Elemento de fijacion.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2474799A (en) * 1944-08-29 1949-06-28 Dzus William Fastener
US3488815A (en) * 1967-10-05 1970-01-13 Norco Inc Quick release fastener
US3898716A (en) * 1973-02-01 1975-08-12 Dzus Fastener Co Rotatable stop fastener
US4067090A (en) * 1976-01-07 1978-01-10 Dzus Fastener Co., Inc. Fastener

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE31184C (de) * M. RUBIN in Philadelphia, V. St. A Schraubverschlufs für Flaschen
US2477818A (en) * 1944-07-10 1949-08-02 Murdock David Cable connector
US3009719A (en) * 1959-06-19 1961-11-21 Aluminum Extrusions Inc Locking mortise and tenon joint
US3253310A (en) * 1965-05-04 1966-05-31 Norco Inc Releasable two-part fastener
DE1500840A1 (de) * 1966-07-22 1969-11-27 Mccarthy John J Mechanische Kupplung
CH458841A (de) * 1967-07-13 1968-06-30 Siemens Ag Albis Bajonettverschluss zur Befestigung von entfernbaren Geräteteilen
US3675280A (en) * 1970-03-06 1972-07-11 Inter Locked Fasteners Ltd Fasteners

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2474799A (en) * 1944-08-29 1949-06-28 Dzus William Fastener
US3488815A (en) * 1967-10-05 1970-01-13 Norco Inc Quick release fastener
US3898716A (en) * 1973-02-01 1975-08-12 Dzus Fastener Co Rotatable stop fastener
US4067090A (en) * 1976-01-07 1978-01-10 Dzus Fastener Co., Inc. Fastener

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8725042B2 (en) 1995-03-27 2014-05-13 Canon Kabushiki Kaisha Coupling part, photosensitive drum, process cartridge and electrophotographic image forming apparatus
US20110211863A1 (en) * 1995-03-27 2011-09-01 Canon Kabushiki Kaisha Coupling part, photosensitive drum, process cartridge and electrophotographic image forming apparatus
US9046860B2 (en) 1995-03-27 2015-06-02 Canon Kabushiki Kaisha Coupling part, photosensitive drum, process cartridge and electrophotographic image forming apparatus
US10856600B2 (en) 2007-04-16 2020-12-08 Riddell, Inc. Quick release connector
US9788591B2 (en) 2007-04-16 2017-10-17 Riddell, Inc. Quick release connector
US20110017521A1 (en) * 2009-07-23 2011-01-27 Mettler-Toledo Ag Gravimetric measuring instrument with releasable load receiver
US8426753B2 (en) * 2009-07-23 2013-04-23 Mettler-Toledo Ag Gravimetric measuring instrument with releasable load receiver
US8819871B2 (en) * 2010-03-03 2014-09-02 Kranos Ip Corporation Helmet with partial turn faceguard mounting
US20110214224A1 (en) * 2010-03-03 2011-09-08 Maddux Larry E Helmet with partial turn faceguard mounting
USD965150S1 (en) 2010-07-06 2022-09-27 Howmedica Osteonics Corp. Prosthesis anchor
USD840539S1 (en) 2010-07-06 2019-02-12 Tornier, Inc. Prosthesis anchor
US11278428B2 (en) 2011-07-19 2022-03-22 Howmedica Osteonics Corp. Osteotome extractor
US9289218B2 (en) * 2011-07-19 2016-03-22 Tornier, Inc. Osteotome extractor
US20130261630A1 (en) * 2011-07-19 2013-10-03 Robert Courtney, Jr. Osteotome extractor
US10213243B2 (en) 2011-07-19 2019-02-26 Tornier, Inc. Osteotome extractor
US20150104247A1 (en) * 2013-10-15 2015-04-16 Dtech Precision Industries Co., Ltd. Grooved rotatably fastening structure, rotatably fastening combo, and packaging structure
US9841044B2 (en) * 2013-10-15 2017-12-12 Dtech Precision Industries Co., Ltd. Grooved rotatably fastening structure, rotatably fastening combo, and packaging structure
US12023253B2 (en) 2014-01-24 2024-07-02 Howmedica Osteonics Corp. Humeral implant anchor system
US10456264B2 (en) 2014-01-24 2019-10-29 Tornier, Inc. Humeral implant anchor system
US11628067B2 (en) 2014-01-24 2023-04-18 Howmedica Osteonics Corp. Humeral implant anchor system
US11432933B2 (en) 2014-01-24 2022-09-06 Howmedica Osteonics Corp. Humeral implant anchor system
US10463499B2 (en) 2016-03-25 2019-11-05 Tornier, Inc. Stemless shoulder implant with fixation components
US11660200B2 (en) 2016-03-25 2023-05-30 Howmedica Osteonics Corp. Stemless shoulder implant with fixation components
US11389300B2 (en) 2016-03-25 2022-07-19 Howmedica Osteonics Corp. Stemless shoulder implant with fixation components
US11129724B2 (en) 2016-07-28 2021-09-28 Howmedica Osteonics Corp. Stemless prosthesis anchor component
US11766335B2 (en) 2016-07-28 2023-09-26 Howmedica Osteonics Corp. Stemless prosthesis anchor component
US11974925B2 (en) 2017-09-25 2024-05-07 Howmedica Osteonics Corp. Patient specific stemless prosthesis anchor components
US11399948B2 (en) 2017-12-11 2022-08-02 Howmedica Osteonics Corp. Stemless prosthesis anchor components and kits
US11364127B2 (en) 2018-10-02 2022-06-21 Howmedica Osteonics Corp. Shoulder prosthesis components and assemblies
USD985125S1 (en) 2019-10-01 2023-05-02 Howmedica Osteonics Corp. Humeral implant
US11642223B2 (en) 2019-10-01 2023-05-09 Howmedica Osteonics Corp. Shoulder prosthesis components and assemblies
USD951449S1 (en) 2019-10-01 2022-05-10 Howmedica Osteonics Corp. Humeral implant

Also Published As

Publication number Publication date
ATE2631T1 (de) 1983-03-15
DE2964906D1 (en) 1983-03-31
EP0011913A1 (de) 1980-06-11
EP0011913B1 (de) 1983-02-23

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